Peter nayloe



o como oeQOooooOOQ ooOoQoQo 00006 OO o Qoo ing, A, A, is a root of metalrepresented as Ifollowing is a full and exact description PETER NAYLOR,OF

NEW YORK, N. Y.

MODE OF SUPPORTING METAL ROOFS.

Specification of Letters Patent No. 1,631, dated June 12, 1840.

thereof.

In Figure 1, 1n the accompanying drawcomposed of sheets united togetherby riveting, and bent so as to form a series of parallel arches. Themetallic roofing may, however, be made in other forms, as my plan ofsupport is independent of the particular shape given to the metal platesconstituting the covering. B, B, are iron truss beams placed above theroof, and spanning across the same so that their ends may rest upon theside walls. The upper portion, or arched part, a, a, of these beams Imake of cast iron, in any convenient number of pieces which may beunited together by screw bolts, in the ordinary way, the ends of thedifferent pieces butting against each other, that they may properlysustain the thrust to which they are to be subjected. The chord piecesZ1, b, are to be of wrought iron, which is to be acted upon by tensionalone. These chord pieces may be made in one or more parts; when morethan one piece is used the parts are to be secured together by eyes andkeys or bolts. These wrought iron chord pieces must be firmly connectedat their ends with the cast iron arch pieces. The former should beturned up at each end so as to constitute shoulders, which are, tooperate as abutments within which the ends of the arches are received.Intermediate arch pieces c, c, c, of wrought or cast iro-n, are

placed between the arch andk string pieces along the whole beam; or,instead of arches, the pieces c, c, c, may be formed into circles,ovals, or otherwise. f

To sustain the roof upon the suspension principle, there are wroughtiron rods, or bolts, e, c, e, which pass through suitable holes in thearch, the string pieces, and the roof plates, said bolts having headswhichV rest upon the arch pieces, and being furnished with screw nuts attheir lower ends,

which are tightened beneath the roof plates, there being ilat ironsupport plates, which operate as washers, and bear against thev underside of the roof plates, as shown at al, Fig. P By the aid of thesetruss beams so placed, the metal rooiing will be sustained entirely fromabove,without beams, props, posts, or other devices being used in theapartment which they cover.

Having thus fully explained the nature of my invention, and shown themanner in which I carry the same into operation, what I claim asconstituting my improvement, and desire to secure by Letters Patent, is-

The combining of iron truss beams, constructed in the manner hereindescribed, with the plates constituting the metallic rooting, said trussbeams being placed above the roong, and sustaining the same upon thesuspension principle, substantially as set forth.

f PETER NAYLOR. lVitnesses GEORGE STEVENS, K. S. VAN Vocal-11s.

